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Please help, how do I fix this? I can't update because it just says for one of the entries: The following signatures couldn't be verified because the public key is not available. How do I install the public key needed?

randomperson123
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1 Answers1

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Classic error when using custom repositories. In order to fix, you need to run the following command:

sudo apt-key adv --keyserver keys.gnupg.net --recv-keys YOUR_KEY where YOUR_KEY is replaced with the key you need, e.g: 8B48AD6246925553.

There are also a number of other keyservers available if you'd prefer. For example, you could replace keys.gnupg.net with keyserver.ubuntu.com if you'd rather use Ubuntu's own keyserver, however this does not usually matter.

After running the command, then sudo apt update again, and it should work :)

Daniel M.
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  • apt-key is now deprecated, and the tool recommends managing keyring files in trusted.gpg.d instead. – henrebotha Sep 15 '22 at 07:08
  • For older workloads where you still need to use these, I've found as of today that instead of keys.gnupg.net you can use pgpkeys.mit.edu and it worked fine. – fagiani Nov 23 '22 at 19:57